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The other day I used my Ludlum survey meter to check out if any of my old junk electrical part may show any traces of radioactivity. I was rather surprised to find an old meter movement magnet showed some activity. Today I took some pictures while determining just how much activity there was. With the Ludlum meter can't tell what type of radioactivity it is, but since I had to have the detector really close, I guessing either beta or alpha. It turned out that the activity was coming from a rivet that's holding the laminates together. I'm getting somewhere between 600 and 800 Counts/minute. Any comments welcome.
The magnet laminates showing the rivet:
Activity on the X0.1 scale:
Activity on the X1 scale:
The magnet laminates showing the rivet:
Activity on the X0.1 scale:
Activity on the X1 scale: